Bkand



Sept. 11, 1923. 1,467,428

W. HlLDEBRAND FEED HEAD FOR STEAM BOILERS Filed Aug. 26 1921 6 D 3 f c? I 7 o 0 Patented Sept. 11, 1923.

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WILHELM HILDEBR-AND, 0E BERLIN-LICHTENBERG, GERMANY, Assreivo To HANDEL MAATCHAPPIJ H, ALBERT DE BABY & oo., 0E AMSTERDAM, NETHERLANDS,VA

DUTCH COMPANY.

FEED HEAD Eon STEAM BOIL RS.

Application -fi1ed August 26; 1921. sci-m1 No. 495,511.

To all whom it may concern:

Be it known that I, lVIL-HELM HILDE- BRAND, a German citizen, residing at Neue Bahnli'ofstrasse 9-17, Berlin-Lichtenberg,

Germany, have invented certain new and useful Improvements in Feed Heads for Steam Boilers (for which I have filed applications in the following countries: Germany, 12th December, 1917; Austria, 4th December, 1918; Hungary, 4th December, 1918; Norway, 8th January, 1919; Poland, 16th March, 1921; Rumania, 17th March, 1921), of which the following is a specification.

This invention relates to a feed head for steam boilers particularly for locomotive boilers. The feed heads hitherto in general use which consists of a stop valve and a nonreturn valve placed in front of it, possess the disadvantage that the non-return valve frequently becomes leaky, owing to its being subjected to wear all on one side through the current of water flowing away all on one side. According to this invention this disadvantage is obviated by the fact that the current. of water flowing from the pump to the boiler enters vertically under the non-return valve and after it has passed through the seat of the valve divides into two symmetrical arms leading downwards and which combine again prior to their entrance intothe boiler stop valve proper. By this means all currents are avoided which run one-sidedly out of the valve seat and would be liable to cause one-sided wear of the valve.

A further object of the invention lies in the fact that the feed head is provided with an outlet branch controlled by a valve and leading into the open air. The valve which controls this branch is so connected to the main stop valve that it shuts off the branch leading into the open air when the main stop valve is opened, and conversely opens it when the latter is closed. By this means the possibility, which is always present in an ordinary feed head, of the feed pipe being destroyed by the feed water which is under pressure and can find no outlet, as is the case when the boiler is being fed with the stop valve closed, is avoided, a danger which particularly existed where piston pumps were employed for feeding. If the age. A

boiler stop valve should be inadvertently keptclosed when the feed head according to this invention is used, while the pump or injector is started, the current of water supplied flows through the open branch leading into the open air without causing any damconstructional form of the subject matter of the invention is illustrated by way of example in the drawing in three sectional figures.

Figure 1 is a longitudinal section on the line AB of Figure 2, as viewed. from the right, the valve spindles and valve bodies being omitted,

Fi ure 2 is a longitudinal section on the line D.-D of Figure 1,

Figure 8 is-a transverse section on the line E-F of Figure 1.

On the casing 1 is mounted the cover 2. The valve seat 3 is inserted in the valve casing and is extended upwards -in the form of a sleeve so as to form a guide for the body of the valve. This extension has two openings 6 and e in it shown clearly in Figure 2 and indicated by dotted lines in Figure 1, and. through which the feed water passes into the semicircular arms 0 and 0 which are situated beneath and surround the valve seat. These'arms combine again in front of the boiler stop: valve 6 to form the passage 0. cl is the connection of the valve to the boiler. 7 is the valve spindle for the boiler stop valve with its hand wheel 9. To spindle 7 is attached the pivoted lever 8 and to the latter is pivoted the valve 5 which controls the branch 6 which leads into the open air. When the main valve 6 is closed (see Figure 3) the valve 5 is open (see Figure 2) and vice versa. If both the valves 5 and 6 are in an intermediate position, the nonreturn valve t prevents water from the boiler from flowing back into the feed pipe. When feeding the water enters at a from the pump into the valve casing, passes, if the valve 5 is closed, vertically under the non-return valve, lifts it and flows through the openings 6 and 6 provided in the guide sleeve of the valve on the outside of the branch which carries the valve seat and is situated in. the interior of the valve casing and into the semicircular pass-ages c and 0 arranged around it which unlte at 0.

Passing through the open stop valve 6 it then passes through the branch cl into the boiler.

vVhat I claim and desire to secure by Letter Patent of the United States is 1. In a feed head for steam boilers, particularly applicable for use with locomotive boilers, a casing comprising a main tubular portion having therein a vertical Water inlet passage and a cylindrical chamber of larger diameter above said passage, an inner tube lining the upper part of said passage and projecting into said. cylindrical chamber, said inner tube forming a valve seat and being horizontally slotted at diametrically opposite parts thereof, a pressure-actuated non-return valve Working in said inner tube and adapted when. lifted to uncover the slotted parts of such inner tube to give communication between said vertical Water inlet passage and, said cylindrical chamber, an approximately semi-circular hollow extension of said casing open to the said cylindrical chamber and comprising two symmetrical. curved substantially horizontal passages below said cylindrical? chamber, an outlet branch of said casing comprising a second chamber located at the level of said curved passages, said curved passages uniting in a single inlet to said second chamber, and a stop valve adapted to Work in said outlet branch beyond said second chamber.

2-. A safety feedv head for steam boilers having in combination a stop valve, a. nonreturn valve located ahead. thereof, a Water passage passing vertically under the nonreturn valve and then divided into two symmetrical arms leading downwards andcombining again in front of the stop valve, a 1

connection leading, into the. open air, a valve controlling said connection and means whereby when the said valve opens the said stop valve, closes and vice versa.

WILHELM HILDEBRAND. 

